Rotary pump



Oct. 28, 1952 M. G. EDWARDS ROTARY PUMP Filed Sept. 9, 1950 IN V EN TOR.

M700 ay [diva/d5 BY JA 7 7W ATTORNEYS,

Patented Oct. 28, 1952 s, PATENT ,orrlce, v

ROTARY PUMP Miloii G a jEdwardsJoplin, Moi, assignortofeefi l ess.Machinery' 00., Joplin, Mo.-,- a corporation AipplicatiomScptember 9,1950, Serial No.183,-993

This invention, relates-L to. ma pumps an d more particularly torotarypumps. of the internal.

gear or rotor and idler.v pinion. type,v and .has' for:

its principalobje'ct toprovide apum'p of smaller increased ca acity; isobtained; by making the.

pumps larger in diameter-I.

Eurther. ObjGCtSQ f tl'ieIpresent inventiori are to provide a"rorary'pump of the internal gear;

type with;a rotor structureiandidlerf'pinion of longer' length in asmaller, lighter; moreserv'ice able pump than other such rotaryv pumpsof equal capacity; to provide a pump of the'inte'rnal gear" type inwhich the. bars. ofthe' internal gear are supported at each end of'therotor; to provide such a purnpwith asupporting bearing ring on the freeends of the internal gear or rotor teeth, said supporting ringhavingbearing contact with cooperating portions ofthe pump housing; and toprovide a' pump of this'character which is economical tomanufactureand-assemble, and efficient in operation overlong periods ofuse.

In accomplishing these and'other objects of the" present invention, Ihave provided improved details of structure; the preferredforms of-whichare. illustrated in the" accompanying drawings,

Whgeim I Fig. 1 is a longitudinal sectional view of a pump embodying thefeatuieso f-"th'e present in- Fig; 2; is a' detailed disassembledperspective view of the rotor and supporting bearing ring therefor.

Fig. 3 is a transverse sectional view on the line 3-3, Fig. 1. v I

Referring more in detail to the drawings:

l designates a pump comprising a casing 2 having a cylindrical bore 3which encloses an internal gear or rotor 4 in the form of a cagecomprising bars 5 and spaces 6 between the bars 5. The rotor is securedas by a key I to a drive shaft 3 connected with any suitable prime moverto drive the rotor. The drive shaft is rotatably mounted in bearings Sand 10 and passes through a packing gland H. The casing 2 preferablyconsists of a shell 52 open at each end, the open ends being closed byend plates l3 and i4 secured ampsr. trieiintermizgear;

to the shell by meansof'fas'tening' devices; such as screws l5.'-Gaskets [6 are interposed between theend' plates'andth'eshell' to'for'ma seal and each of'said en'dplates has annular shoulders I? whichextendinand closely" engage the bore 3;

of the' shellifor centering the end plates on said shell. "The end plate13' has an x n boss: is; extending-outwardly frorn'the casingandlsuitably bored to receive the bearing 9', packing- Wand packinggland H. Thb'oss also has an extension 20' spaced from thepacking glandand suitably bored to receivelthe bearing Ii! which is preferably of theantifriction adjustabletype,v the bearing 10 beingheld in theextensionby a suitable bearing retainer 2l and the' inner; race beingadjustableby mie'ans'of nuts 22 andlocli; nuts'23'threaded on the"'shaftt. The end'plate, I3 also has a depending portion 24 terminatingin" a base plate 25 having" suitable apertures 26. for recewmgrastemngjdevices for' securing the pump on any suitablesupport, aZbraceZTconmeeting the base plate" 25"with theboss extension" 20tdcoo'perateviiith a'rib 28 to form a strong, rigidst'ructure.

e end plate tending intothef casing and'upon' which islr'otat ablyounted a toothed idler-sci saididlerkpref erably having a bushing 3| ofsuitabIeLb'earin'g material which operates on the" stub shaftjZB.

Theaxis of the stub shafti fi is ofiset relative to the axis of thedrive shaft 8so thatthe maximum diameter of the idler 30L isconsiderably less than the maximumdiameter of the rotor 4,, said idlerbeing located whereby the teeth 32. thereof enter the spacesv 6' betweenthebars 5 on one side of therotoriand the peripheries 353' oi the'te'ethengage the inner surface of the shell I 2" when said teeth extend theirmaximum .jdista'nce' into the spaces 6- of the rotor'l Acrescent-shaped" to the end plate 14 and extending therefrom into thecasing whereby the free end 35 of the crescent-shaped filler has slidingengagement with the adjacent face 36 of a solid, disk-like portion 31from which the bars 5 of the rotor extend.

of substantially the same length as the bars 5 whereby the ends ofthetoothed idler slidably engage the face 36 of the disk portion-s1 of themarries a Santana" a:

filler 3'41 ans. the eccentric vI spacebetweeri' the other side? of Itheidler 3 0 and 1 mner surface" o'f'th'e" bars 5 oftlie" rear" 4; as'illustrated in Fig. 3, said crescent-shaped filler being integral withor otherwise suitably fixed-- rotor 4 and the inner face 31' of theportion of the end plate l4 which extends into the shell l2.

A ring 38 is secured to the free ends of the bars 5, preferably byfastening devices, such as screws 39, which extend through countersunkapertures 49 in the ring and are threaded into threaded apertures 4|located centrally of the free ends of the bars 5'and aligned with theapertures 40., The outer periphery of the ring 38 is of the same size asthe peripheries of the disk-like portion 31 and bars 5 whereby the ringslidably engages the inner surface of the bore 3 in the shell [2. Thebore in the ring 38 is of such size whereby the inner surface 42 thereofcoincides with the inner surfaces of the bars 5 and slidably engages ashoulder 43 formed by an undercut portion in the inside of the end plateI4, said undercut portion providing an extension on the end plate l4 andforming with the bore 3 an annular recess. The outer surface 44 of saidring also has sliding contact with the inner face 45 of the undercutportion of the end plate whereby the engagement of the ring with the endplate serves as a bearing support for the ends of the bars 5 of therotor 4.

Also the ring connects the free ends of the bars, giving added strengththereto, whereby therotor may be longer than in conventional pumps toprovideincreased capacity, or in other wordsthe pump is smaller indiameter than conventional pumps of equal capacity.

When the drive shaft 8 is operated todrive the rotor 4 in the directionof the arrow, Fig. 3, the rotation of'the rotor automatically rotatesthe idler 30'because of the engagement of the teeth 32 on the idler withthe bars 5 on the rotor. As the rotor 4 rotates, the teeth 32 arewithdrawn from the spaces 6 adjacent the inlet port 46 in the casing,This produces a partial vacuum which draws liquid into theinlet port andfills the spaces 6 in the rotor and-also the spaces 41 between the teeth32 ofthe idler with the liquid. The liquid in the spaces 6 and 41 isretained therein by the crescent-shaped filler 34 until'the spaces 6 and41 come into the area comprising the outlet port 48. 'As'the teeth 32move to fit between the bars 5, the liquid in the spaces 6 and 41 isforcibly ejected into the outlet port,48. The pumpacts as a force pumpwhereby liquid going through the pump is forced out of the outlet portunder substantial pressure," but the possibility of the high pressuresdamaging the rotor and bars thereof is greatly reduced due to thebearing supporting ring 38 reinforcing the outer ends of thebars 5 andsupporting said bars on the shoulder and undercut portion in the endplate l4.

It is believed obvious that I have provided a rotary pump structurewhich will operate over long periods of time and'is adapted to be made.

longer than conventional. pumps to form a smaller, lighter pump andamore serviceable pump than others of equal capacity.

What I claim and desire to secure by Letters Patent is:

A rotary pump of the character described comprising, a shell having acylindrical bore and an inlet port and an outlet port communicating withsaid bore, end plates sealingly secured to the shell and closing thebore atthe ends thereof, one of said end plates having 'a portionextending into the bore concentric thereto and forming an annular recesstherewith, a drive shaft rotatably mounted in the other end plateaxially of the'cylindrical bore, a rotor including a disk portionsecured to the shaft adjacent said other end plate and having aplurality of peripherally spaced parallel bars extending from the disklongitudinally of the shell bore and terminating in free ends adjacentsaid one end plate, said disk and bars having peripheral bearingengagement with the cylindrical bore of the shell, a ring in the annularrecess and having bearing engagement with the shell bore and said oneend plate, means securing the ring tothe free end of each of the rotorbars whereby the ring connects'said bars and provides bearing supporttherefor on said, one end plate, a toothed idler member coextensive withthe rotor bars, means on said oneend plate rotatably mounting the idlermember inside of and eccentrically of the rotor whereby the teeth of theidler member mesh'with the rotor bars and extend through the spacestherebetween to engage the shell bore between the inlet and outletports, and a crescent-shaped member coextensive with the rotor bars andfixedto said extending portion of said one end plate and extendinglongitudinally of the shell bore between the inner surface of,

the rotor bars and periphery of the idler teeth and forming a sealtherebetween whereby rotation of the driveshaft rotates the rotor andidler member and forcibly delivers liquid from the inlet port to theoutlet port.

MILON GAY EDWARDS. REFERENCES CITED The following references are ofrecord file of this patent;

UNITED STATES PATENTS in the Number Name 7 Date 1,496,737 Petersen June3, 1924 1,787,543 Nichols Jan. 6, 1931 1,802,527 Nichols Apr. 28, 19311,972,565 Kempton Sept. 4, 1934 2,140,966 Nichols Dec. 20, 1938 FOREIGNPATENTS Number I Country Date 476,515 Great Britain Dec. 10, 1937

